Fibre optic trees have gone through spells of immense popularity in recent decades, though perhaps more people now associate fibre optic with broadband internet than Christmas trees! There are broadly two types of fibre optic tree, one in which the fibre optics are only evident at the tips of the Christmas tree, and the other where pretty much the entire tree is illuminated. Usually these trees are multi coloured, with the colours running through the optics changing gradually from one colour to another, to another. You can also have trees that only transition between a couple of colours or even just a single colour though, giving a slightly more classic appearance.